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Use zend_string for phar alias #17511

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Use zend_string for phar alias #17511

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f97d8f2
Remove unused arguments from phar_free_alias()
nielsdos Jan 18, 2025
0379bbd
Use zend_string for phar alias
nielsdos Jan 18, 2025
8d0161a
fix ub
nielsdos Jan 19, 2025
17efa1d
review round
nielsdos Jan 19, 2025
b9aa47e
persistent fix
nielsdos Jan 19, 2025
076572b
another one
nielsdos Jan 19, 2025
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10 changes: 5 additions & 5 deletions ext/phar/dirstream.c
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Original file line number Diff line number Diff line change
Expand Up @@ -280,7 +280,7 @@ php_stream *phar_wrapper_open_dir(php_stream_wrapper *wrapper, const char *path,

phar_request_initialize();

if (FAILURE == phar_get_archive(&phar, ZSTR_VAL(resource->host), ZSTR_LEN(resource->host), NULL, 0, &error)) {
if (FAILURE == phar_get_archive(&phar, ZSTR_VAL(resource->host), ZSTR_LEN(resource->host), NULL, &error)) {
if (error) {
php_stream_wrapper_log_error(wrapper, options, "%s", error);
efree(error);
Expand Down Expand Up @@ -359,7 +359,7 @@ int phar_wrapper_mkdir(php_stream_wrapper *wrapper, const char *url_from, int mo
return 0;
}

if (FAILURE == phar_get_archive(&phar, arch, arch_len, NULL, 0, NULL)) {
if (FAILURE == phar_get_archive(&phar, arch, arch_len, NULL, NULL)) {
phar = NULL;
}

Expand Down Expand Up @@ -388,7 +388,7 @@ int phar_wrapper_mkdir(php_stream_wrapper *wrapper, const char *url_from, int mo
return 0;
}

if (FAILURE == phar_get_archive(&phar, ZSTR_VAL(resource->host), ZSTR_LEN(resource->host), NULL, 0, &error)) {
if (FAILURE == phar_get_archive(&phar, ZSTR_VAL(resource->host), ZSTR_LEN(resource->host), NULL, &error)) {
php_stream_wrapper_log_error(wrapper, options, "phar error: cannot create directory \"%s\" in phar \"%s\", error retrieving phar information: %s", ZSTR_VAL(resource->path) + 1, ZSTR_VAL(resource->host), error);
efree(error);
php_url_free(resource);
Expand Down Expand Up @@ -487,7 +487,7 @@ int phar_wrapper_rmdir(php_stream_wrapper *wrapper, const char *url, int options
return 0;
}

if (FAILURE == phar_get_archive(&phar, arch, arch_len, NULL, 0, NULL)) {
if (FAILURE == phar_get_archive(&phar, arch, arch_len, NULL, NULL)) {
phar = NULL;
}

Expand Down Expand Up @@ -516,7 +516,7 @@ int phar_wrapper_rmdir(php_stream_wrapper *wrapper, const char *url, int options
return 0;
}

if (FAILURE == phar_get_archive(&phar, ZSTR_VAL(resource->host), ZSTR_LEN(resource->host), NULL, 0, &error)) {
if (FAILURE == phar_get_archive(&phar, ZSTR_VAL(resource->host), ZSTR_LEN(resource->host), NULL, &error)) {
php_stream_wrapper_log_error(wrapper, options, "phar error: cannot remove directory \"%s\" in phar \"%s\", error retrieving phar information: %s", ZSTR_VAL(resource->path)+1, ZSTR_VAL(resource->host), error);
efree(error);
php_url_free(resource);
Expand Down
8 changes: 4 additions & 4 deletions ext/phar/func_interceptors.c
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Original file line number Diff line number Diff line change
Expand Up @@ -109,7 +109,7 @@ static zend_string* phar_get_name_for_relative_paths(zend_string *filename, bool
/* fopen within phar, if :// is not in the url, then prepend phar://<archive>/ */
/* retrieving a file defaults to within the current directory, so use this if possible */
phar_archive_data *phar;
if (FAILURE == phar_get_archive(&phar, arch, arch_len, NULL, 0, NULL)) {
if (FAILURE == phar_get_archive(&phar, arch, arch_len, NULL, NULL)) {
efree(arch);
return NULL;
}
Expand Down Expand Up @@ -515,7 +515,7 @@ static void phar_file_stat(const char *filename, size_t filename_length, int typ
entry = estrndup(filename, filename_length);
/* fopen within phar, if :// is not in the url, then prepend phar://<archive>/ */
entry_len = filename_length;
if (FAILURE == phar_get_archive(&phar, arch, arch_len, NULL, 0, NULL)) {
if (FAILURE == phar_get_archive(&phar, arch, arch_len, NULL, NULL)) {
efree(arch);
efree(entry);
goto skip_phar;
Expand Down Expand Up @@ -759,7 +759,7 @@ PHP_FUNCTION(phar_is_file) /* {{{ */
/* fopen within phar, if :// is not in the url, then prepend phar://<archive>/ */
entry_len = filename_len;
/* retrieving a file within the current directory, so use this if possible */
if (SUCCESS == phar_get_archive(&phar, arch, arch_len, NULL, 0, NULL)) {
if (SUCCESS == phar_get_archive(&phar, arch, arch_len, NULL, NULL)) {
phar_entry_info *etemp;

entry = phar_fix_filepath(estrndup(entry, entry_len), &entry_len, 1);
Expand Down Expand Up @@ -825,7 +825,7 @@ PHP_FUNCTION(phar_is_link) /* {{{ */
/* fopen within phar, if :// is not in the url, then prepend phar://<archive>/ */
entry_len = filename_len;
/* retrieving a file within the current directory, so use this if possible */
if (SUCCESS == phar_get_archive(&phar, arch, arch_len, NULL, 0, NULL)) {
if (SUCCESS == phar_get_archive(&phar, arch, arch_len, NULL, NULL)) {
phar_entry_info *etemp;

entry = phar_fix_filepath(estrndup(entry, entry_len), &entry_len, 1);
Expand Down
77 changes: 39 additions & 38 deletions ext/phar/phar.c
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Original file line number Diff line number Diff line change
Expand Up @@ -133,7 +133,7 @@ static void phar_split_cache_list(void) /* {{{ */
len = strlen(key);
}

if (SUCCESS == phar_open_from_filename(key, len, NULL, 0, 0, &phar, NULL)) {
if (SUCCESS == phar_open_from_filename(key, len, NULL, 0, &phar, NULL)) {
phar->phar_pos = i++;
php_stream_close(phar->fp);
phar->fp = NULL;
Expand Down Expand Up @@ -194,8 +194,8 @@ PHP_INI_END()
*/
void phar_destroy_phar_data(phar_archive_data *phar) /* {{{ */
{
if (phar->alias && phar->alias != phar->fname) {
pefree(phar->alias, phar->is_persistent);
if (phar->alias) {
zend_string_release_ex(phar->alias, phar->is_persistent);
phar->alias = NULL;
}

Expand Down Expand Up @@ -258,7 +258,8 @@ bool phar_archive_delref(phar_archive_data *phar) /* {{{ */
} else if (!phar->refcount) {
/* invalidate phar cache */
PHAR_G(last_phar) = NULL;
PHAR_G(last_phar_name) = PHAR_G(last_alias) = NULL;
PHAR_G(last_phar_name) = NULL;
PHAR_G(last_alias) = NULL;

if (phar->fp && (!(phar->flags & PHAR_FILE_COMPRESSION_MASK) || !phar->alias)) {
/* close open file handle - allows removal or rename of
Expand Down Expand Up @@ -486,7 +487,7 @@ void phar_entry_remove(phar_entry_data *idata, char **error) /* {{{ */
/**
* Open an already loaded phar
*/
static zend_result phar_open_parsed_phar(char *fname, size_t fname_len, char *alias, size_t alias_len, bool is_data, uint32_t options, phar_archive_data** pphar, char **error) /* {{{ */
static zend_result phar_open_parsed_phar(char *fname, size_t fname_len, zend_string *alias, bool is_data, uint32_t options, phar_archive_data** pphar, char **error) /* {{{ */
{
phar_archive_data *phar;
#ifdef PHP_WIN32
Expand All @@ -506,7 +507,7 @@ static zend_result phar_open_parsed_phar(char *fname, size_t fname_len, char *al
phar_unixify_path_separators(fname, fname_len);
}
#endif
if (SUCCESS == phar_get_archive(&phar, fname, fname_len, alias, alias_len, error)
if (SUCCESS == phar_get_archive(&phar, fname, fname_len, alias, error)
&& ((alias && fname_len == phar->fname_len
&& !strncmp(fname, phar->fname, fname_len)) || !alias)
) {
Expand Down Expand Up @@ -1256,9 +1257,11 @@ static zend_result phar_parse_pharfile(php_stream *fp, char *fname, size_t fname
}

mydata->alias = alias ?
pestrndup(alias, alias_len, mydata->is_persistent) :
pestrndup(mydata->fname, fname_len, mydata->is_persistent);
mydata->alias_len = alias ? alias_len : fname_len;
zend_string_init(alias, alias_len, mydata->is_persistent) :
zend_string_init(mydata->fname, fname_len, mydata->is_persistent);
if (mydata->is_persistent) {
GC_MAKE_PERSISTENT_LOCAL(mydata->alias);
}
mydata->sig_flags = sig_flags;
mydata->fp = fp;
mydata->sig_len = sig_len;
Expand All @@ -1270,14 +1273,14 @@ static zend_result phar_parse_pharfile(php_stream *fp, char *fname, size_t fname

mydata->is_temporary_alias = temp_alias;

if (!phar_validate_alias(mydata->alias, mydata->alias_len)) {
if (!phar_validate_alias(ZSTR_VAL(mydata->alias), ZSTR_LEN(mydata->alias))) {
signature = NULL;
fp = NULL;
MAPPHAR_FAIL("Cannot open archive \"%s\", invalid alias");
}

if (NULL != (fd_ptr = zend_hash_str_find_ptr(&(PHAR_G(phar_alias_map)), alias, alias_len))) {
if (SUCCESS != phar_free_alias(fd_ptr, alias, alias_len)) {
if (SUCCESS != phar_free_alias(fd_ptr)) {
signature = NULL;
fp = NULL;
MAPPHAR_FAIL("Cannot open archive \"%s\", alias is already in use by existing archive");
Expand Down Expand Up @@ -1315,7 +1318,7 @@ static zend_result phar_parse_pharfile(php_stream *fp, char *fname, size_t fname
/**
* Create or open a phar for writing
*/
zend_result phar_open_or_create_filename(char *fname, size_t fname_len, char *alias, size_t alias_len, bool is_data, uint32_t options, phar_archive_data** pphar, char **error) /* {{{ */
zend_result phar_open_or_create_filename(char *fname, size_t fname_len, zend_string *alias, bool is_data, uint32_t options, phar_archive_data** pphar, char **error) /* {{{ */
{
const char *ext_str, *z;
char *my_error;
Expand Down Expand Up @@ -1345,7 +1348,7 @@ zend_result phar_open_or_create_filename(char *fname, size_t fname_len, char *al
return FAILURE;
}
check_file:
if (phar_open_parsed_phar(fname, fname_len, alias, alias_len, is_data, options, test, &my_error) == SUCCESS) {
if (phar_open_parsed_phar(fname, fname_len, alias, is_data, options, test, &my_error) == SUCCESS) {
if (pphar) {
*pphar = *test;
}
Expand Down Expand Up @@ -1380,15 +1383,15 @@ zend_result phar_open_or_create_filename(char *fname, size_t fname_len, char *al

if (ext_len > 3 && (z = memchr(ext_str, 'z', ext_len)) && ((ext_str + ext_len) - z >= 2) && !memcmp(z + 1, "ip", 2)) {
/* assume zip-based phar */
return phar_open_or_create_zip(fname, fname_len, alias, alias_len, is_data, options, pphar, error);
return phar_open_or_create_zip(fname, fname_len, alias ? ZSTR_VAL(alias) : NULL, alias ? ZSTR_LEN(alias) : 0, is_data, options, pphar, error);
}

if (ext_len > 3 && (z = memchr(ext_str, 't', ext_len)) && ((ext_str + ext_len) - z >= 2) && !memcmp(z + 1, "ar", 2)) {
/* assume tar-based phar */
return phar_open_or_create_tar(fname, fname_len, alias, alias_len, is_data, options, pphar, error);
return phar_open_or_create_tar(fname, fname_len, alias ? ZSTR_VAL(alias) : NULL, alias ? ZSTR_LEN(alias) : 0, is_data, options, pphar, error);
}

return phar_create_or_parse_filename(fname, fname_len, alias, alias_len, is_data, options, pphar, error);
return phar_create_or_parse_filename(fname, fname_len, alias ? ZSTR_VAL(alias) : NULL, alias ? ZSTR_LEN(alias) : 0, is_data, options, pphar, error);
}
/* }}} */

Expand Down Expand Up @@ -1499,7 +1502,7 @@ zend_result phar_create_or_parse_filename(char *fname, size_t fname_len, char *a
phar_archive_data *fd_ptr;

if (alias && NULL != (fd_ptr = zend_hash_str_find_ptr(&(PHAR_G(phar_alias_map)), alias, alias_len))) {
if (SUCCESS != phar_free_alias(fd_ptr, alias, alias_len)) {
if (SUCCESS != phar_free_alias(fd_ptr)) {
if (error) {
spprintf(error, 4096, "phar error: phar \"%s\" cannot set alias \"%s\", already in use by another phar archive", mydata->fname, alias);
}
Expand All @@ -1515,8 +1518,7 @@ zend_result phar_create_or_parse_filename(char *fname, size_t fname_len, char *a
}

ZEND_ASSERT(!mydata->is_persistent);
mydata->alias = alias ? estrndup(alias, alias_len) : estrndup(mydata->fname, fname_len);
mydata->alias_len = alias ? alias_len : fname_len;
mydata->alias = alias ? zend_string_init(alias, alias_len, false) : zend_string_init(mydata->fname, fname_len, false);
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}

if (alias_len && alias) {
Expand Down Expand Up @@ -1548,7 +1550,7 @@ zend_result phar_create_or_parse_filename(char *fname, size_t fname_len, char *a
* that the manifest is proper, then pass it to phar_parse_pharfile(). SUCCESS
* or FAILURE is returned and pphar is set to a pointer to the phar's manifest
*/
zend_result phar_open_from_filename(char *fname, size_t fname_len, char *alias, size_t alias_len, uint32_t options, phar_archive_data** pphar, char **error) /* {{{ */
zend_result phar_open_from_filename(char *fname, size_t fname_len, zend_string *alias, uint32_t options, phar_archive_data** pphar, char **error) /* {{{ */
{
php_stream *fp;
zend_string *actual;
Expand All @@ -1562,7 +1564,7 @@ zend_result phar_open_from_filename(char *fname, size_t fname_len, char *alias,
is_data = true;
}

if (phar_open_parsed_phar(fname, fname_len, alias, alias_len, is_data, options, pphar, error) == SUCCESS) {
if (phar_open_parsed_phar(fname, fname_len, alias, is_data, options, pphar, error) == SUCCESS) {
return SUCCESS;
} else if (error && *error) {
return FAILURE;
Expand Down Expand Up @@ -1590,7 +1592,7 @@ zend_result phar_open_from_filename(char *fname, size_t fname_len, char *alias,
fname_len = ZSTR_LEN(actual);
}

zend_result ret = phar_open_from_fp(fp, fname, fname_len, alias, alias_len, options, pphar, error);
zend_result ret = phar_open_from_fp(fp, fname, fname_len, alias ? ZSTR_VAL(alias) : NULL, alias ? ZSTR_LEN(alias) : 0, options, pphar, error);

if (actual) {
zend_string_release_ex(actual, 0);
Expand Down Expand Up @@ -2322,7 +2324,7 @@ zend_result phar_split_fname(const char *filename, size_t filename_len, char **a
* Invoked when a user calls Phar::mapPhar() from within an executing .phar
* to set up its manifest directly
*/
zend_result phar_open_executed_filename(char *alias, size_t alias_len, char **error) /* {{{ */
zend_result phar_open_executed_filename(zend_string *alias, char **error) /* {{{ */
{
if (error) {
*error = NULL;
Expand All @@ -2337,7 +2339,7 @@ zend_result phar_open_executed_filename(char *alias, size_t alias_len, char **er
return FAILURE;
}

if (phar_open_parsed_phar(ZSTR_VAL(fname), ZSTR_LEN(fname), alias, alias_len, 0, REPORT_ERRORS, NULL, 0) == SUCCESS) {
if (phar_open_parsed_phar(ZSTR_VAL(fname), ZSTR_LEN(fname), alias, 0, REPORT_ERRORS, NULL, 0) == SUCCESS) {
return SUCCESS;
}

Expand Down Expand Up @@ -2370,7 +2372,7 @@ zend_result phar_open_executed_filename(char *alias, size_t alias_len, char **er
fname = actual;
}

zend_result ret = phar_open_from_fp(fp, ZSTR_VAL(fname), ZSTR_LEN(fname), alias, alias_len, REPORT_ERRORS, NULL, error);
zend_result ret = phar_open_from_fp(fp, ZSTR_VAL(fname), ZSTR_LEN(fname), alias ? ZSTR_VAL(alias) : NULL, alias ? ZSTR_LEN(alias) : 0, REPORT_ERRORS, NULL, error);

if (actual) {
zend_string_release_ex(actual, 0);
Expand Down Expand Up @@ -2544,7 +2546,7 @@ void phar_flush_ex(phar_archive_data *phar, zend_string *user_stub, bool is_defa

phar_entry_info *entry, *newentry;
size_t halt_offset;
int restore_alias_len, global_flags = 0;
int global_flags = 0;
bool must_close_old_file = false;
bool has_dirs = false;
char manifest[18], entry_buffer[24];
Expand Down Expand Up @@ -2860,12 +2862,14 @@ void phar_flush_ex(phar_archive_data *phar, zend_string *user_stub, bool is_defa
* 4: phar metadata length
* ?: phar metadata
*/
restore_alias_len = phar->alias_len;
if (phar->is_temporary_alias) {
phar->alias_len = 0;
size_t written_alias_len;
if (phar->is_temporary_alias || !phar->alias) {
written_alias_len = 0;
} else {
written_alias_len = ZSTR_LEN(phar->alias);
}

manifest_len = offset + phar->alias_len + sizeof(manifest) + (main_metadata_str.s ? ZSTR_LEN(main_metadata_str.s) : 0);
manifest_len = offset + written_alias_len + sizeof(manifest) + (main_metadata_str.s ? ZSTR_LEN(main_metadata_str.s) : 0);
phar_set_32(manifest, manifest_len);
/* Hack - see bug #65028, add padding byte to the end of the manifest */
if(manifest[0] == '\r' || manifest[0] == '\n') {
Expand All @@ -2882,18 +2886,17 @@ void phar_flush_ex(phar_archive_data *phar, zend_string *user_stub, bool is_defa
*(manifest + 9) = (unsigned char) (((PHAR_API_VERSION_NODIR) & 0xF0));
}
phar_set_32(manifest+10, global_flags);
phar_set_32(manifest+14, phar->alias_len);
phar_set_32(manifest+14, written_alias_len);

/* write the manifest header */
if (sizeof(manifest) != php_stream_write(newfile, manifest, sizeof(manifest))
|| (size_t)phar->alias_len != php_stream_write(newfile, phar->alias, phar->alias_len)) {
|| (written_alias_len > 0 && written_alias_len != php_stream_write(newfile, ZSTR_VAL(phar->alias), written_alias_len))) {

if (must_close_old_file) {
php_stream_close(oldfile);
}

php_stream_close(newfile);
phar->alias_len = restore_alias_len;

if (error) {
spprintf(error, 0, "unable to write manifest header of new phar \"%s\"", phar->fname);
Expand All @@ -2902,8 +2905,6 @@ void phar_flush_ex(phar_archive_data *phar, zend_string *user_stub, bool is_defa
goto cleanup;
}

phar->alias_len = restore_alias_len;

phar_set_32(manifest, main_metadata_str.s ? ZSTR_LEN(main_metadata_str.s) : 0);
if (4 != php_stream_write(newfile, manifest, 4) || ((main_metadata_str.s ? ZSTR_LEN(main_metadata_str.s) : 0)
&& ZSTR_LEN(main_metadata_str.s) != php_stream_write(newfile, ZSTR_VAL(main_metadata_str.s), ZSTR_LEN(main_metadata_str.s)))) {
Expand All @@ -2914,7 +2915,6 @@ void phar_flush_ex(phar_archive_data *phar, zend_string *user_stub, bool is_defa
}

php_stream_close(newfile);
phar->alias_len = restore_alias_len;

if (error) {
spprintf(error, 0, "unable to write manifest meta-data of new phar \"%s\"", phar->fname);
Expand Down Expand Up @@ -3271,7 +3271,7 @@ static zend_op_array *phar_compile_file(zend_file_handle *file_handle, int type)
return phar_orig_compile_file(file_handle, type);
}
if (strstr(ZSTR_VAL(file_handle->filename), ".phar") && !strstr(ZSTR_VAL(file_handle->filename), "://")) {
if (SUCCESS == phar_open_from_filename(ZSTR_VAL(file_handle->filename), ZSTR_LEN(file_handle->filename), NULL, 0, 0, &phar, NULL)) {
if (SUCCESS == phar_open_from_filename(ZSTR_VAL(file_handle->filename), ZSTR_LEN(file_handle->filename), NULL, 0, &phar, NULL)) {
if (phar->is_zip || phar->is_tar) {
zend_file_handle f;

Expand Down Expand Up @@ -3456,7 +3456,8 @@ void phar_request_initialize(void) /* {{{ */
if (!PHAR_G(request_init))
{
PHAR_G(last_phar) = NULL;
PHAR_G(last_phar_name) = PHAR_G(last_alias) = NULL;
PHAR_G(last_phar_name) = NULL;
PHAR_G(last_alias) = NULL;
PHAR_G(has_bz2) = zend_hash_str_exists(&module_registry, "bz2", sizeof("bz2")-1);
PHAR_G(has_zlib) = zend_hash_str_exists(&module_registry, "zlib", sizeof("zlib")-1);
PHAR_G(request_init) = 1;
Expand Down
16 changes: 7 additions & 9 deletions ext/phar/phar_internal.h
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -150,8 +150,7 @@ ZEND_BEGIN_MODULE_GLOBALS(phar)
/* phar_get_archive cache */
char* last_phar_name;
uint32_t last_phar_name_len;
char* last_alias;
uint32_t last_alias_len;
zend_string*last_alias;
phar_archive_data* last_phar;
HashTable mime_types;
ZEND_END_MODULE_GLOBALS(phar)
Expand Down Expand Up @@ -248,8 +247,7 @@ struct _phar_archive_data {
/* for phar_detect_fname_ext, this stores the location of the file extension within fname */
char *ext;
uint32_t ext_len;
char *alias;
uint32_t alias_len;
zend_string *alias;
char version[12];
size_t halt_offset;
HashTable manifest;
Expand Down Expand Up @@ -405,12 +403,12 @@ void phar_object_init(void);
void phar_destroy_phar_data(phar_archive_data *phar);

zend_result phar_postprocess_file(phar_entry_data *idata, uint32_t crc32, char **error, int process_zip);
zend_result phar_open_from_filename(char *fname, size_t fname_len, char *alias, size_t alias_len, uint32_t options, phar_archive_data** pphar, char **error);
zend_result phar_open_or_create_filename(char *fname, size_t fname_len, char *alias, size_t alias_len, bool is_data, uint32_t options, phar_archive_data** pphar, char **error);
zend_result phar_open_from_filename(char *fname, size_t fname_len, zend_string *alias, uint32_t options, phar_archive_data** pphar, char **error);
zend_result phar_open_or_create_filename(char *fname, size_t fname_len, zend_string *alias, bool is_data, uint32_t options, phar_archive_data** pphar, char **error);
zend_result phar_create_or_parse_filename(char *fname, size_t fname_len, char *alias, size_t alias_len, bool is_data, uint32_t options, phar_archive_data** pphar, char **error);
zend_result phar_open_executed_filename(char *alias, size_t alias_len, char **error);
zend_result phar_free_alias(phar_archive_data *phar, char *alias, size_t alias_len);
zend_result phar_get_archive(phar_archive_data **archive, char *fname, size_t fname_len, char *alias, size_t alias_len, char **error);
zend_result phar_open_executed_filename(zend_string *alias, char **error);
zend_result phar_free_alias(phar_archive_data *phar);
zend_result phar_get_archive(phar_archive_data **archive, char *fname, size_t fname_len, zend_string *alias, char **error);
zend_result phar_verify_signature(php_stream *fp, size_t end_of_phar, uint32_t sig_type, char *sig, size_t sig_len, char *fname, char **signature, size_t *signature_len, char **error);
zend_result phar_create_signature(phar_archive_data *phar, php_stream *fp, char **signature, size_t *signature_length, char **error);

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